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Method of imaging and developing positive-working imageable elements

Inactive Publication Date: 2009-11-26
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024]The present invention provides imaged elements from highly sensitive positive-working precursors in a manner that is more environmentally acceptable. The problems associated with known highly alkaline, silicate-containing developers are avoided. In addition, the developing conditions are relatively mild compared to those used in known methods. Further, processing of the imaged elements is simplified in that the development and “gumming” functions are carried out using a single processing solution. These advantages are achieved by using a relatively simple single processing solution containing carbonate and an anionic surfactant.

Problems solved by technology

While such developers are effective to remove imaged portions of the imageable layer, they can react undesirably with aluminum substrates and generate toxic waste solutions that create problems for disposal.

Method used

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  • Method of imaging and developing positive-working imageable elements
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  • Method of imaging and developing positive-working imageable elements

Examples

Experimental program
Comparison scheme
Effect test

invention example 1

[0164]An imageable element of the present invention was prepared in the following manner using the following positive-working infrared radiation-sensitive composition formulation:

Polymer A0.9020 gLB 9900 (49% in PM)0.1220 gS 0094 IR Dye0.0300 gCrystal Violet0.0240 gSudan Black B0.0240 gDMABA0.1560 gPolyfox ® PF 652 (10% in PM)0.0360 gMEK 4.83 gPM 8.88 g

[0165]The formulation was filtered and applied to an electrochemically roughened and anodized aluminum substrate that had been subjected to a treatment with an aqueous solution of sodium phosphate / sodium fluoride by means of common methods and the resulting imageable layer coating was dried for 30 seconds at 100° C. in Glunz&Jensen “Unigraph Quartz” oven. The dry coverage of the imageable layer was about 1.5 g / m2. The single imageable layer was the outermost layer of the imageable element. The imageable element was conditioned with interleave paper for two days at 60° C. and 25% RH.

[0166]The resulting imageable element was exposed on ...

invention example 2

[0167]Imageable elements were prepared, imaged, and processed using the same general procedure described above for Invention Example 1, this time processing the imaged element for 60 seconds and using the following infrared radiation-sensitive composition formulation:

Polymer A0.7460 gLB 9900 (49% in PM)0.0490 gS0094 IR Dye0.0240 gCrystal Violet0.0190 gSudan Black B0.0190 gDMABA0.1250 gPolyfox ® PF 652 (10% in PM)0.0290 gMEK 3.86 gPM 7.13 g

The results obtained for Invention Example 2 are shown below in TABLE I.

invention example 3

[0168]An imageable element was prepared, imaged, and processed using the same general procedure described above for the Invention Example 1, but this time the imaged and processed element was dried at 60° C. for 1 minute. Twenty hours later, the lithographic printing plate was mounted on a Heidelberg GTO-52 printing press, washed with water, and used to make 150,000 high quality impressions (200 lpi). TABLE I

TABLE ISensitivityLinearityCyan Density(Clearing Point)Point (LP)Loss (CDL)Imageable Element(mJ / cm2)(mJ / cm2)(%)Invention Example 11001509.7(M-1 at 26° C. / 80 sec)Invention Example 21101508.0(M-1 at 26° C. / 60 sec)

[0169]The results in TABLE I show that a positive-working, infrared radiation-sensitive imageable element prepared using a formulation containing Polymer A can be processed (developed) revealing the latent image using the carbonate-containing M-1 single processing solution according to the present invention. The results of Invention Example 3 show that the printing surfac...

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Abstract

A method of making imaged elements such as lithographic printing plates is achieved by imagewise exposing an infrared radiation-sensitive positive-working imageable element to provide exposed and non-exposed regions. The imaged element is developed using a single processing solution having a pH of from about 9 to about 11.5 and containing carbonate ion and at least 1 weight % of one or more anionic surfactants, to remove predominantly only the exposed regions to provide an image and to provide a protective coating on the imaged surface. The imageable element comprises a substrate and a radiation absorbing compound, and has an imageable layer on the substrate that comprises a developability-enhancing compound and a poly(vinyl acetal) in which at least 25 mol % of its recurring units comprise pendant nitro-substituted phenolic groups.

Description

FIELD OF THE INVENTION[0001]This invention relates to a method of preparing imaged elements such as lithographic printing plates from positive-working imageable elements containing unique poly(vinyl acetal) binders using a single carbonate processing solution that contains an anionic surfactant.BACKGROUND OF THE INVENTION[0002]In lithographic printing, ink receptive regions, known as image areas, are generated on a hydrophilic surface. When the surface is moistened with water and ink is applied, the hydrophilic regions retain the water and repel the ink, the ink receptive regions accept the ink and repel the water. The ink is then transferred to the surface of suitable materials upon which the image is to be reproduced. In some instances, the ink can be first transferred to an intermediate blanket that in turn is used to transfer the ink to the surface of the materials upon which the image is to be reproduced.[0003]Imageable elements useful to prepare lithographic (or offset) printi...

Claims

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Application Information

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IPC IPC(8): G03F7/12G03F7/004
CPCB41C1/1008G03F7/322B41C2210/02B41C2210/06Y10S430/145B41C2210/22B41C2210/24B41C2210/262B41C2210/20
Inventor LEVANON, MOSHENAKASH, MOSHE
Owner EASTMAN KODAK CO
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